Contains resources that may be provided to a service when it initializes, which includes other
services defined in the registry. ServiceResources provides access to other services (it extends
org.apache.tapestry.ioc.ObjectLocator ).
Returns a Log object appropriate for logging messages. This includes debug level messages
about the creation and configuration of the underlying service, as well as debug, warning, or
error level messages from the service itself. Often service interceptors will make use of the
service's log.